William a



' 'w. 'A. TERRY.

Calendar Clock.-

' No. 79,026. Patented June 16,1868,

ILPETERS. WLSNINGTON. 0.6.

WILLIAM-LA. TERRY, OF BRISTOL, CONNECTICUT.

Letters Patent .No. 79,026, dated June s, 1868.

IMPROVEMENT IN CALENDAR-CLOCKS.

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TO ALL WHCM IT MAY CONCERN:

Be it known that I, WILLIAM A. TERRY, of Bristol, in the county of Hartford, and State of Connecticut, have invented a new and useful Improvement in Calendars for Clocks; and I do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled in the art can make and use the same, reicrence being had to the accompanying drawings, and to the letters of reference marked thereon.

Figure 1 shows the calendar as it appears on the face of aelock.

Figures 2 and-3 show the parts of the mechanism of the calendar separated from the dial and index.

Figure 4 is an edge view of the mechanism of the calendar.

Figure 5, together with fig. 4, shows the manner in which the index' of the calendar is secured to the socket. I

Like letters in the several figures indicate the same parts.

The object of my invention is to make a calendar, to be attached toclocks, which shall be more simple, durable, and economical flian'those now in use, and be more easily set and regulated when the clock has been stopped from any cause. V a v My invention consists in arranging, on one arbor or common axis, two wheels-one of which has thirty-two teeth, and the other forty-eight, or, if it is desired to make the calendar for one year only, it has twelve-in such a mannerthat the first, or month-wheel, shall revolve once a month, carrying the second, or year-wheel,

with it, at the end of which time the year-wheel moves forward upon the month-wheel one tooth or division, and goes round with it another month, as before.

It also consists in, attaching an index or pointer to the month-wheel, which revolves with it, and indicates the days of the month by suitable figures upon the dial; and in attaching a circular disk, marked with the months of the year, to the year-wheel, so that the difi'erential movement between the wheels shall indicate the successive months.

It also consists in thepeculiar mechanism for regulating the movement of the month-wheel, so that the index shall register the proper number of days in each month, and complete one full revolution in each month without regard to the number of days in it.

A is the disk, attached to the gear-wheel C, or set firmly on the same arbor, on which are marked the months of the year. This is shown in the drawings as arranged for four years, so as to make a perpetual calendar, and not require changing for leap-year.

B is the index or pointer, attached to the arbor of themonth-wheel D, which passes through that of .the year-wheel. The relative position of these wheels and the disk is shown in fig. 4. I

In figs. 2 and 3 the wheel C is shown removed from the top of the wheel D, so as to=show the parts more clearly. I

E is a twenty-four-hour wheel, forming partof, or attached to, the clock-movement. This has upon it two pins, 6 and c, for moving and operatingthe calendar.

The pin 0 engages with and moves forward one tooth of the wheel D at each revolution of E. The pin 6 .is-

shorter than c, and passes under the wheel D, and engages with the pawl a when the revolution of D brings it to the proper position.

a a is a pawl or dog, with one armfa, on one side of the wheel D, and the other, a, on the' opposite side, connected together by an axis passing through the wheel. This pawl or dog is for the purpose of taking up and passing over the extra teeth-in the wheel Dfor months having less than thirty-one days. It also serves to take up the thirty-second tooth of the month-wheeh while the index changes for the next month.

The wheel C is providedwith a number of pins, 1, m, n, &c., placed in. such positions that, at the end of each month before one having less than .thir'ty one days, the pawl a a, when released from the pin 6, shall have its end, a, fall against the proper one of them to regulate the position of the pawl, so that it shall be taken up by the pin 6 at theproper, time togivejtlieiright number of days in the following month.

There is one of these pins for each month in the four years that has less than thirty-one days. These on the circle Z are for the thirty-day months. The one, m, nearer the centre, is for the month of February in leapyear, and the three others, n, are for the month of February in the other three years. The position of these pins over the wheel D is shown by the'small red circles in fig. 2.

g is a pinion, carried round upon an arm attached to the wheel D, and gearing into the wheel C. This pinion, at each revolution of D, engages with the pin it, and movesthe' wheel 0 forward one tooth upon the wheel D. With the exception of this differential movement at the end of each month,the wheels D and C revolve together.

f is a spring, one end of which is attached to the wheel D, and the other presses upon the teeth of C, in order to keep the wheels together, except when moved by the pin h. i

2' is a spring, one end of whichis secured to the clock-frame, and the'other presses against the teeth of the wheel D, to keep it in its position when not operated upon by the pins 6 or c.

The axis upon which the wheel D is fixed works inside of that of the wheel G, and inside of both are the arbors for the handsof the clock B B.

To attach the index or pointer firmly to the socket, forming the axis ofD, it has'a male projection or key, 7c, which fits into a slot, j, cut in the socket.

The operation of my invention is as follows The wheel E, in revolving, moves the month-wheel D one tooth each day, by means of the pin 0, until it comes to the end of themo nth, when the pin I} takes up the extra teeth, and brings the month-wheel again to its starting-point.

When the month has thirty-one days, the pawl a falls against the stop d, at the end of the previous month, in which position the end, a, is taken up by the pin 11, at the cnd'of the thirty-first revolution of E, andearried forward against the spring e, till the end, or, strikes against the axis on'which the wheels turn, when the pawl stops, and the pin 11 carries the wheel D over the thirty-second tooth at the same time that the pin It engages one of the leaves of the pinion g, and moves the gear-wheel one tooth forward. 7

If the next month has thirty days, the end, a, of thcpawl is left resting under one of the pins in'the circle Z, which is placed in the proper position to receiveit and raise the-end, a, so that it shall be one tooth in advance of where it was before. This causes thepawl to be taken up by the pinb o ne revolution of E sooner than before, and the index passes over two teeth at once by means of the pawl, instead. of one, as before. The yearwheel is also moved one tooth as the pinion g passes the pin hi i When the month has twenty-nine or twenty-eight days, the end, a,'of the pawl is raised the propernumber of teeth higher, so as to carry the wheel D over the extra teeth by being caught bythe pin b so many revolutions of E sooner. By means of this arrangement the month always commences at the same point of the wheel D, and brings the index to the figure 1 upon the dial.

The differential movement of the two wheels D andC takes place while the index is moving from the blank space after the 31 t0 the point marked 1, so-that the pawl is always left in the proper position to be taken up by the pin 6 at the end of the month. I

If it is not desired that the calendar should be perpetual, the wheel 0 can be made with twelve teeth, and

five pins for the five short months in one year, and revolve uponthe wheel D once in twelve months, instead of forty-eight. In this case the dialA will be arranged for one year instead of four, as shown in the drawings.

The pawl a a can also be made to'work upon the under side of the wheel D, and have the part that rests upon the pins Z, m, 'n, &c., project through an aperture in the wheel.

In order to set the calendar after the clock has been stopped, all that is necessary is to set the long arm of the index upon the day of the month, and turn the month-dial, attached to .the year-wheel, round until the proper month of the proper year relative to leap-year comes under the short arm of the index. The calendar will then go on correctly to the end of the month, and, if it has thirty-one days, will pass on tothe next month correctly. If, however, it be a short month, the index will have to 'be moved forward from the last day of the month to the first of the next, or the same number of days upon the dial at anytime thereafter, when the calendar will continue on correctly as long as the clock runs. The reason of this is, that after turning round the whoelsO and D, the pawl does not rest upon any of the pins, and the'month registers thirty-one days, as before described.

If in any short month it is desired to set the calendar so that it will continue correctly thereafter, the index can be set to the last day of the preceding month, and the clock turned forward twentyfour hours, when the pointer can be moved till the index arrives at the proper day. This will leave the pawl in the right position at the end of the'month. i I

It will be observed that the index cannot be' moved at or near twelve oclock at night, as at that time the pin 0 is engaged with the teeth of the wheel D, and prevents its movement.

The hands of the clock are so placed that the calendar changes at twelve, midnight.

My improved calendar can be attachedto the dial of a clock, the wheels turning upon the same centre as the hands, as in the drawings, or it may be placed at any other part of the'clock-casc, and operated by a wheel similar to E, or by a rod having pins upon it, to perform the same functions as b and c.

The end of the pawl a, instead of working against pins in the wheel 0, can be made to enter into slots or grooves out in that wheel, and; can also, if desired, be made to follow against whatever kind of stops may be used,.so that wherever the calendar may be set, whether the month have thirty-one days or less, it will continue to indicate correctly as long as the clock runs. I

My invention can also be so arranged that it can be used with a sysiem of revolving disks marked with the names of the months and days, so that the number of the day and the name of the month shallshow through openings in the face or other part of the cloc k.

The-advantages of my invention are,'that it has m uch less machinery, is more simple, and less liable to get out of order than calendars nowin use; that it can be used on the same centre as the hands of the clock, and applied to clocks of small size, which is not the ease with others; that it can be easily regulated and set; and that it runs correctly in whatever position it may he started, obviating the most serious objection to the use of other calendars, that it requires a skilled mechanic to keep them in order, and set them when the clock stops.

Claims.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The use of thirty-two teeth in the m outh-wheel,.insteadof thirty-one, substantially as herein specified.

2. The use of a month-wheel with-a year-wheel, or four-years wheel, revolving together upon a common axis, and so arranged that the year-wheel, or four-years wheel, shall change its relative position to the month-' wheel one tooth or division at a certain point in each revolution, substantially as herein described.

3. The combination of the disk A with the wheel C, the pawl a a, the wheel D, and the pinionr, or its equivalent,'constructed and operating substantially as described. 4

4. The disk A, in combination with the 'pointer B, so arranged that, the same pointer shall indicate the month and the day of the month, substantially as described.

I WM. A. TERRY.

Witnesses:

'lnno. G. ELLIS, FRANCIS FELLowns, J1". 

